
class BClass():
    def __init__(self):
        a = 'wangbo'
    

def decorat(cls):
    return BClass

#@decorat
class AClass():
    def __init__(self):
        b = 'dongwei'




a = AClass()

b = AClass
print(isinstance(a, BClass) )
print(issubclass(AClass, BClass))